Imaging lens assembly, imaging apparatus and electronic device

ABSTRACT

An imaging lens assembly includes five lens elements, which are, in order from an object side to an image side, a first lens element, a second lens element, a third lens element, a fourth lens element and a fifth lens element. The first lens element has positive refractive power. The second lens element has positive refractive power. The fourth lens element with negative refractive power has an object-side surface being convex in a paraxial region thereof and an image-side surface being concave in a paraxial region thereof, wherein the two surfaces of the fourth lens element are both aspheric. The fifth lens element having an image-side surface being concave in a paraxial region thereof, wherein two surfaces of the fifth lens element are both aspheric, and the image-side surface of the fifth lens element includes at least one convex critical point in an off-axis region thereof.

RELATED APPLICATIONS

This application claims priority to Taiwan Application Serial Number106109586, filed Mar. 22, 2017, which is herein incorporated byreference.

BACKGROUND Technical Field

The present disclosure relates to an imaging lens assembly and animaging apparatus. More particularly, the present disclosure relates toan imaging lens assembly and an imaging apparatus with compactness andwide field of view applicable to electronic devices.

Description of Related Art

With the wider application of photographing modules, installingphotographing modules in various smart electronic devices, portables,mobile devices, recognition devices, entertainment systems, sportingdevices and smart home assisting systems is becoming a major trend indevelopments for future technology, especially portables with high imagequality being in high demand. In order to obtain more extensiveexperiences in utilizations, smart devices with one, two or more thanthree lens assemblies are becoming the market mainstream, and variousphotographing modules with different features are developed in responseto different demands.

Furthermore, with the recent demands of compact electronic devices,conventional photographing modules are difficult to meet bothrequirements of high quality and compactness, especially compact lensassemblies with the characteristics of large aperture or wider field ofview, etc. By having compact lens configurations in conventional lensassemblies, it is difficult for light from a larger view angle enteringthe photographing modules and thus is unable to provide the feature of alarge field of view. In contrast, if lens configuration of the widefield of view is achieved, the total track length of photographingmodules will be longer and cannot satisfy the demand for compactness.Hence, a photographing module which has both characteristics of widefield of view and compactness to fully satisfy market specifications anddemands is needed.

SUMMARY

According to one aspect of the present disclosure, an imaging lensassembly includes five lens elements, the five lens elements being, inorder from an object side to an image side, a first lens element, asecond lens element, a third lens element, a fourth lens element and afifth lens element. The first lens element has positive refractivepower. The second lens element has positive refractive power. The fourthlens element with negative refractive power has an object-side surfacebeing convex in a paraxial region thereof and an image-side surfacebeing concave in a paraxial region thereof, wherein the object-sidesurface and the image-side surface of the fourth lens element are bothaspheric. The fifth lens element has an image-side surface being concavein a paraxial region thereof, wherein an object-side surface and theimage-side surface of the fifth lens element are both aspheric, and theimage-side surface of the fifth lens element includes at least oneconvex critical point in an off-axis region thereof. When a focal lengthof the imaging lens assembly is f, a focal length of the first lenselement is f1, a focal length of the third lens element is f3, a focallength of the fourth lens element is f4, and a focal length of the fifthlens element is f5, the following conditions are satisfied:

0.75<|f/f4|+|f/f5|; and

|f1/f3|<1.0.

According to another aspect of the present disclosure, an imagingapparatus includes the imaging apparatus of the aforementioned aspectand an image sensor, wherein the image sensor is disposed on an imagesurface of the imaging lens assembly.

According to another aspect of the present disclosure, an electronicdevice includes the imaging apparatus of the aforementioned aspect.

According to one aspect of the present disclosure, an imaging lensassembly includes five lens elements, the five lens elements being, inorder from an object side to an image side, a first lens element, asecond lens element, a third lens element, a fourth lens element and afifth lens element. The first lens element has positive refractivepower. The second lens element with positive refractive power has animage-side surface being convex in a paraxial region thereof. The fourthlens element with negative refractive power has an image-side surfacebeing concave in a paraxial region thereof, wherein an object-sidesurface and the image-side surface of the fourth lens element are bothaspheric. The fifth lens element has an image-side surface being concavein a paraxial region thereof, wherein an object-side surface and theimage-side surface of the fifth lens element are both aspheric, and theimage-side surface of the fifth lens element includes at least oneconvex critical point in an off-axis region thereof. When an Abbe numberof the third lens element is V3, and an Abbe number of the fourth lenselement is V4, the following condition is satisfied:

10<V3+V4<60.

BRIEF DESCRIPTION OF THE DRAWINGS

The present disclosure can be more fully understood by reading thefollowing detailed description of the embodiment, with reference made tothe accompanying drawings as follows:

FIG. 1 is a schematic view of an imaging apparatus according to the 1stembodiment of the present disclosure;

FIG. 2 shows spherical aberration curves, astigmatic field curves and adistortion curve of the imaging apparatus according to the 1stembodiment;

FIG. 3 is a schematic view of an imaging apparatus according to the 2ndembodiment of the present disclosure;

FIG. 4 shows spherical aberration curves, astigmatic field curves and adistortion curve of the imaging apparatus according to the 2ndembodiment;

FIG. 5 is a schematic view of an imaging apparatus according to the 3rdembodiment of the present disclosure;

FIG. 6 shows spherical aberration curves, astigmatic field curves and adistortion curve of the imaging apparatus according to the 3rdembodiment;

FIG. 7 is a schematic view of an imaging apparatus according to the 4thembodiment of the present disclosure;

FIG. 8 shows spherical aberration curves, astigmatic field curves and adistortion curve of the imaging apparatus according to the 4thembodiment;

FIG. 9 is a schematic view of an imaging apparatus according to the 5thembodiment of the present disclosure;

FIG. 10 shows spherical aberration curves, astigmatic field curves and adistortion curve of the imaging apparatus according to the 5thembodiment;

FIG. 11 is a schematic view of an imaging apparatus according to the 6thembodiment of the present disclosure;

FIG. 12 shows spherical aberration curves, astigmatic field curves and adistortion curve of the imaging apparatus according to the 6thembodiment;

FIG. 13 is a schematic view of an imaging apparatus according to the 7thembodiment of the present disclosure;

FIG. 14 shows spherical aberration curves, astigmatic field curves and adistortion curve of the imaging apparatus according to the 7thembodiment;

FIG. 15 is a schematic view of parameters Dr1s and Dsr2 according to the1st embodiment of FIG. 1;

FIG. 16 is a three-dimensional schematic view of an imaging apparatusaccording to the 8th embodiment of the present disclosure;

FIG. 17A is a schematic view of one side of an electronic deviceaccording to the 9th embodiment of the present disclosure;

FIG. 17B is a schematic view of another side of the electronic device ofFIG. 17A;

FIG. 17C is a system schematic view of the electronic device of FIG.17A;

FIG. 18 is a schematic view of an electronic device according to the10th embodiment of the present disclosure; and

FIG. 19 is a schematic view of an electronic device according to the11th embodiment of the present disclosure.

DETAILED DESCRIPTION

An imaging lens assembly includes five lens elements, the five lenselements being, in order from an object side to an image side, a firstlens element, a second lens element, a third lens element, a fourth lenselement and a fifth lens element.

The first lens element has positive refractive power, so that it isfavorable for the light from a large view angle converging in theimaging lens assembly. The first lens element can have an image-sidesurface including at least one convex critical point in an off-axisregion thereof. Therefore, it is favorable for the light from a largeview angle converging in the imaging lens assembly so as to avoid thesurface reflection generated from a surface shape being excessivelycurved in the off-axis region of the lens element or to avoid the lightwhich cannot be focused on the imaging surface during light refraction.

The second lens element has positive refractive power, so that the lightcan be guided to an image surface. The second lens element can have animage-side surface being convex in a paraxial region thereof, so thataberrations generated from the first lens element can be corrected so asto enhance the image quality.

The third lens element can have an image-side surface being convex in aparaxial region thereof, so that the ability of the aberrationcorrection of the third lens element can be maintained.

The fourth lens element with negative refractive power has anobject-side surface being convex in a paraxial region thereof and animage-side surface being concave in a paraxial region thereof, so thataberrations of the imaging lens assembly can be corrected. Theobject-side surface of the fourth lens element can include at least oneconcave critical point in an off-axis region thereof, and the image-sidesurface of the fourth lens element can include at least one convexcritical point in an off-axis region thereof. Thus, it is favorable forcorrecting off-axis aberrations of the imaging lens assembly.

The fifth lens element can have positive refractive power and can havean object-side surface being convex in a paraxial region thereof. Thefifth lens element has an image-side surface being concave in a paraxialregion thereof. Therefore, the principal point of the imaging lensassembly can be positioned away from the image surface so as to reducethe back focal length for compactness. The image-side surface of thefifth lens element includes at least one convex critical point in anoff-axis region thereof, so that it is favorable for correcting off-axisaberrations effectively.

When a focal length of the imaging lens assembly is f, a focal length ofthe fourth lens element is f4, and a focal length of the fifth lenselement is f5, the following condition is satisfied: 0.75<|f/f4|+|f/f5|.Therefore, the refractive power of the fourth lens element and the fifthlens element can be enhanced for correcting aberrations of the imaginglens assembly in coordination with the first lens element and the secondlens element with positive refractive power, so as to enhance the imagequality and reduce the back focal length for system miniaturization.Preferably, the following condition can be satisfied:1.25<|f/f4|+|f/f5|<3.5.

When a focal length of the first lens element is f1, and a focal lengthof the third lens element is f3, the following condition is satisfied:|f1/f3|<1.0. Therefore, it is favorable for avoiding weak refractivepower of the first lens element and strong refractive power of the thirdlens element with overly large variation of the refractive power betweenthe lens elements causing aberration overcorrection or insufficientcorrection thereof. Thus, the image quality can be enhanced effectively.

When an Abbe number of the third lens element is V3, and an Abbe numberof the fourth lens element is V4, the following condition is satisfied:10<V3+V4<60. Therefore, it is favorable for enhancing the ability of thechromatic aberration correction of the imaging lens assembly.Preferably, the following condition can be satisfied: 25<V3+V4<50.

When a curvature radius of the object-side surface of the second lenselement is R3, and a curvature radius of the image-side surface of thesecond lens element is R4, the following condition is satisfied:0.75<(R3+R4)/(R3−R4) <4.0. Therefore, the shape arrangement of thesecond lens element is proper with the first lens element, so thataberrations generated from the first lens element can be corrected forenhancing the image quality in the off-axis region of the image.

When the focal length of the first lens element is f1, a focal length ofthe second lens element is f2, the focal length of the third lenselement is f3, the focal length of the fourth lens element is f4, andthe focal length of the fifth lens element is f5, the followingconditions are satisfied: |f4|<|f1|<|f3|; |f5|<|f1|<|f3|;|f4|<|f2|<|f3|; and |f5|<|f2|<|f3|. Therefore, it is favorable forcorrecting aberrations and reducing the total track length so as toobtain the compactness.

When the focal length of the imaging lens assembly is f, a curvatureradius of the object-side surface of the fourth lens element is R7, anda curvature radius of the image-side surface of the fourth lens elementis R8, the following condition is satisfied: (|R7|+|R8|)/f<1.50.Therefore, the curvatures of the two surfaces of the fourth lens elementcan provide sufficient refractive power so as to enhance aberrationcorrection and the application flexibility.

When the focal length of the imaging lens assembly is f, and the focallength of the third lens element is f3, the following condition issatisfied: −1.0<f/f3<0.50. Therefore, it is favorable for avoiding weakrefractive power of the first lens element and strong refractive powerof the third lens element with overly large variation of the refractivepower between the lens elements causing improper aberrations correction.Thus, the image quality can be enhanced effectively.

The imaging lens assembly can further include an aperture stop, whereina displacement in parallel with an optical axis from an axial vertex ofan object-side surface of the first lens element and the aperture stopis Dr1s, and a displacement in parallel with the optical axis from theaperture stop and an axial vertex of the image-side surface of the firstlens element is Dsr2, the following condition is satisfied:|Dr1s/Dsr2|<0.33. Therefore, the arrangement of the aperture stop isproper for the light from a large view angle converging in the imaginglens assembly.

When the focal length of the imaging lens assembly is f, the focallength of the fourth lens element is f4, and the focal length of thefifth lens element is f5, the following condition is satisfied:(f/f4)−(f/f5)<−2.0. Therefore, the refractive power of the fourth lenselement and the fifth lens element can be enhanced for correctingaberrations of the imaging lens assembly in coordination with the firstlens element and the second lens element with positive refractive power.Thus, the image quality can be enhanced and the total track length ofthe back focal length can be reduced so as to obtain compactness.

When a maximum field of view of the imaging lens assembly is FOV, thefollowing condition is satisfied: 85 degrees<FOV<120 degrees. Therefore,it is favorable for obtaining the configuration for compactness and alarge field of view in a wider range of applications and devices.

When an axial distance between the object-side surface of the first lenselement and the image surface is TL, and a maximum image height of theimaging lens assembly is ImgH, the following condition is satisfied:TL/ImgH<1.60. Therefore, it is favorable for obtaining compactness and alarge field of view for a wide range of applications.

When the focal length of the imaging lens assembly is f, and a maximumoptical effective radius of the image-side surface of the fifth lenselement is Y52, the following condition is satisfied: 0.90<f/Y52<1.30.Therefore, it is favorable for enhancing the characteristic of largefield of view and reducing the size of the fifth lens element to obtaincompactness.

When the axial distance between the object-side surface of the firstlens element and the image surface is TL, a maximum image height of theimaging lens assembly is ImgH, and a half of a maximum field of view ofthe imaging lens assembly is HFOV, the following condition is satisfied:1.80<TL/ImgH+1/tan(HFOV)<2.60. Therefore, it is favorable for obtainingcompactness and a large field of view for a wider range of applicationsand devices.

When the focal length of the first lens element is f1, and the focallength of the second lens element is f2, the following condition issatisfied: 0.70<|f1/f2|<1.70. Therefore, it is favorable for the lightfrom large field of view converging onto the image surface by thearrangement of the first lens element and the second lens element.

When a curvature radius of an object-side surface of the third lenselement is R5, a curvature radius of the image-side surface of the thirdlens element is R6, and the focal length of the imaging lens assembly isf, the following condition is satisfied: (|R5|+|R6|)/f<1.0. Therefore,the configuration of the two surfaces of the third lens element providessufficient refractive power to enhance the ability of aberrationcorrection of the third lens element.

When the focal length of the fourth lens element is f4, and the focallength of the fifth lens element is f5, the following condition issatisfied: −2.0<f4/f5<−0.75. Therefore, it is favorable for avoiding theexcessive difference between the refractive power of the fourth lenselement and the fifth lens element causing insufficient aberrationcorrection or aberration overcorrection.

When an Abbe number of the first lens element is V1, an Abbe number ofthe second lens element is V2, the Abbe number of the third lens elementis V3, and the Abbe number of the fourth lens element is V4, thefollowing condition is satisfied: 1.75<(V1+V2)/(V3+V4)<3.50. Therefore,it is favorable for enhancing the image quality by improving chromaticaberration correction of the imaging lens assembly.

Each of the aforementioned features of the imaging lens assembly can beutilized in numerous combinations, so as to achieve the correspondingeffects.

According to the imaging lens assembly of the present disclosure, thelens elements thereof can be made of glass or plastic materials. Whenthe lens elements are made of plastic materials, manufacturing costs canbe effectively reduced. When the lens elements are made of glassmaterials, the distribution of the refractive power of the imaging lensassembly may be more flexible to design. Furthermore, surfaces of eachlens element can be arranged to be aspheric, since the aspheric surfaceof the lens element is easy to form a shape other than a sphericalsurface so as to have more controllable variables for eliminatingaberrations thereof, and to further decrease the required amount of lenselements in the imaging lens assembly. Therefore, the total track lengthof the imaging lens assembly can also be reduced.

According to the imaging lens assembly of the present disclosure, eachof an object-side surface and an image-side surface has a paraxialregion and an off-axis region. The paraxial region refers to the regionof the surface where light rays travel close to an optical axis, and theoff-axis region refers to the region of the surface away from theparaxial region. Particularly unless otherwise stated, when the lenselement has a convex surface, it indicates that the surface can beconvex in the paraxial region thereof; when the lens element has aconcave surface, it indicates that the surface can be concave in theparaxial region thereof. According to the imaging lens assembly of thepresent disclosure, the refractive power or the focal length of a lenselement being positive or negative may refer to the refractive power orthe focal length in a paraxial region of the lens element.

According to the imaging lens assembly of the present disclosure, theimaging lens assembly can include at least one stop, such as an aperturestop, a glare stop or a field stop. Said glare stop or said field stopis for eliminating the stray light and thereby improving the imageresolution thereof.

According to the imaging lens assembly of the present disclosure, theimage surface of the imaging lens assembly, based on the correspondingimage sensor, can be flat or curved. In particular, the image surfacecan be a concave curved surface facing towards the object side.According to the imaging lens assembly of the present disclosure, atleast one image correcting element (such as a field flattener) can beselectively disposed between the lens element closest to the image sideof the imaging lens assembly and the image surface so as to correct theimage (such as the field curvature). Properties of the image correctingelement, such as curvature, thickness, refractive index, position,surface shape (convex/concave, spherical/aspheric/diffractive/Fresneletc.) can be adjusted according to the requirements of the imagingapparatus. In general, the image correcting element is preferably a thinplanar-concave element having a concave surface toward the object sideand is disposed close to the image surface.

According to the imaging lens assembly of the present disclosure, anaperture stop can be configured as a front stop or a middle stop. Afront stop disposed between an object and the first lens element canprovide a longer distance between an exit pupil of the imaging lensassembly and the image surface, and thereby obtains a telecentric effectand improves the image-sensing efficiency of the image sensor, such asCCD or CMOS. A middle stop disposed between the first lens element andthe image surface is favorable for enlarging the field of view of theimaging lens assembly and thereby provides a wider field of view for thesame.

According to the imaging lens assembly of the present disclosure, acritical point is a non-axial point of the lens surface where itstangent is perpendicular to the optical axis, wherein a convex criticalpoint is a critical point located on a convex shape of the lens surface,and the shape of the critical point (convex or concave) is determined bythe positive or negative sign of the curvature at the critical point.

According to the imaging lens assembly of the present disclosure, theimage capturing lens system can be applied to 3D (three-dimensional)image capturing applications, in products such as digital cameras,mobile devices, digital tablets, smart TVs, surveillance systems, motionsensing input devices, driving recording systems, rearview camerasystems, and wearable devices.

According to the present disclosure, an imaging apparatus is provided.The imaging apparatus includes the aforementioned imaging lens assemblyand an image sensor, wherein the image sensor is disposed on the imageside of the aforementioned imaging lens assembly, that is, the imagesensor can be disposed on or near the image surface of theaforementioned imaging lens assembly. It is favorable for the light fromlarge field of view converging in the imaging lens assembly by thepositive refractive power of the first lens element, and guiding theincident light to the image surface by the positive refractive power ofthe second lens element, so as to satisfy the demand of wide field ofview and compactness. Furthermore, it is favorable for correctingaberrations by the fourth lens element with negative refractive power,so that the image quality can be enhanced. Preferably, the imagingapparatus can further include a barrel member, a holder member or acombination thereof.

According to the present disclosure, an electronic device is provided,which includes the aforementioned imaging apparatus. Preferably, theelectronic device can further include but not limited to a control unit,a display, a storage unit, a random access memory unit (RAM) or acombination thereof.

According to the above description of the present disclosure, thefollowing 1st-11th specific embodiments are provided for furtherexplanation.

1st Embodiment

FIG. 1 is a schematic view of an imaging apparatus according to the 1stembodiment of the present disclosure. FIG. 2 shows spherical aberrationcurves, astigmatic field curves and a distortion curve of the imagingapparatus according to the 1st embodiment. In FIG. 1, the imagingapparatus includes an imaging lens assembly (its reference numeral isomitted) and an image sensor 180. The imaging lens assembly includes, inorder from an object side to an image side, an aperture stop 100, afirst lens element 110, a stop 101, a second lens element 120, a thirdlens element 130, a fourth lens element 140, a fifth lens element 150,an IR-cut filter 160 and an image surface 170, wherein the image sensor180 is disposed on the image surface 170 of the imaging lens assembly.The imaging lens assembly includes five lens elements (110, 120, 130,140 and 150) without additional one or more lens elements insertedbetween the first lens element 110 and the fifth lens element 150.

The first lens element 110 with positive refractive power has anobject-side surface 111 being convex in a paraxial region thereof and animage-side surface 112 being concave in a paraxial region thereof. Thefirst lens element 110 is made of a plastic material, and has theobject-side surface 111 and the image-side surface 112 being bothaspheric. Furthermore, the image-side surface 112 of the first lenselement 110 includes at least one convex critical point in an off-axisregion thereof.

The second lens element 120 with positive refractive power has anobject-side surface 121 being concave in a paraxial region thereof andan image-side surface 122 being convex in a paraxial region thereof. Thesecond lens element 120 is made of a plastic material, and has theobject-side surface 121 and the image-side surface 122 being bothaspheric.

The third lens element 130 with negative refractive power has anobject-side surface 131 being concave in a paraxial region thereof andan image-side surface 132 being convex in a paraxial region thereof. Thethird lens element 130 is made of a plastic material, and has theobject-side surface 131 and the image-side surface 132 being bothaspheric.

The fourth lens element 140 with negative refractive power has anobject-side surface 141 being convex in a paraxial region thereof and animage-side surface 142 being concave in a paraxial region thereof. Thefourth lens element 140 is made of a plastic material, and has theobject-side surface 141 and the image-side surface 142 being bothaspheric. Furthermore, the object-side surface 141 of the fourth lenselement 140 includes at least one concave critical point in an off-axisregion thereof, and the image-side surface 142 of the fourth lenselement 140 includes at least one convex critical point in an off-axisregion thereof.

The fifth lens element 150 with positive refractive power has anobject-side surface 151 being convex in a paraxial region thereof and animage-side surface 152 being concave in a paraxial region thereof. Thefifth lens element 150 is made of a plastic material, and has theobject-side surface 151 and the image-side surface 152 being bothaspheric. Furthermore, the image-side surface 152 of the fifth lenselement 150 includes at least one convex critical point in an off-axisregion thereof.

The IR-cut filter 160 is made of a glass material and located betweenthe fifth lens element 150 and the image surface 170, and will notaffect the focal length of the imaging lens assembly.

The equation of the aspheric surface profiles of the aforementioned lenselements of the 1st embodiment is expressed as follows:

${{X(Y)} = {{\left( {Y^{2}/R} \right)/\left( {1 + {{sqrt}\left( {1 - {\left( {1 + k} \right) \times \left( {Y/R} \right)^{2}}} \right)}} \right)} + {\sum\limits_{i}{({Ai}) \times \left( Y^{i} \right)}}}},$

where,

X is the relative distance between a point on the aspheric surfacespaced at a distance Y from the optical axis and the tangential plane atthe aspheric surface vertex on the optical axis;

Y is the vertical distance from the point on the aspheric surface to theoptical axis;

R is the curvature radius;

k is the conic coefficient; and

Ai is the i-th aspheric coefficient.

In the imaging lens assembly according to the 1st embodiment, when afocal length of the imaging lens assembly is f, an f-number of theimaging lens assembly is Fno, and half of a maximum field of view of theimaging lens assembly is HFOV, these parameters have the followingvalues: f=2.19 mm; Fno=2.25; and HFOV=47.5 degrees.

In the imaging lens assembly according to the 1st embodiment, when amaximum field of view of the imaging lens assembly is FOV, the followingcondition is satisfied: FOV=95.00 degrees.

In the imaging lens assembly according to the 1st embodiment, when anAbbe number of the first lens element 110 is V1, an Abbe number of thesecond lens element 120 is V2, an Abbe number of the third lens element130 is V3, and an Abbe number of the fourth lens element 140 is V4, thefollowing condition are satisfied: (V1+V2)/(V3+V4)=2.81; and V3+V4=39.9.

In the imaging lens assembly according to the 1st embodiment, when acurvature radius of the object-side surface 121 of the second lenselement 120 is R3, and a curvature radius of the image-side surface 122of the second lens element 120 is R4, the following condition issatisfied: (R3+R4)/(R3−R4)=1.73.

In the imaging lens assembly according to the 1st embodiment, when thefocal length of the imaging lens assembly is f, a curvature radius ofthe object-side surface 131 of the third lens element 130 is R5, acurvature radius of the image-side surface 132 of the third lens element130 is R6, a curvature radius of the object-side surface 141 of thefourth lens element 140 is R7, and a curvature radius of the image-sidesurface 142 of the fourth lens element 140 is R8, the followingconditions are satisfied: (|R5|+|R6|)/f=0.48; and (|R7|+|R8|)/f=0.91.

FIG. 15 is a schematic view of parameters Dr1s and Dsr2 according to the1st embodiment of FIG. 1. In FIG. 15, when a displacement in parallelwith the optical axis from an axial vertex of the object-side surface111 of the first lens element 110 and the aperture stop 100 is Dr1s(when the point of the object-side surface 111 of the first lens element110 on the optical axis or the axial vertex, is closer to the objectside than a central point of the aperture stop 100 to the object side,the value of Dr1s is positive; when the point of the object-side surface111 of the first lens element 110 on the optical axis is closer to theimage side than the central point of the aperture stop 100 to the imageside, the value of Dr1s is negative), and a displacement in parallelwith the optical axis from the aperture stop 100 and an axial vertex ofthe image-side surface 112 of the first lens element 110 is Dsr2 (whenthe central point of the aperture stop 100 is closer to object side thanthe point of the image-side surface 112 of the first lens element 110 onthe optical axis to the object side, the value of Dsr2 is positive; whenthe central point of the aperture stop 100 is closer to image side thanthe point of the image-side surface 112 of the first lens element 110 onthe optical axis to the image side, the value of Dsr2 is negative), thefollowing condition is satisfied: |Dr1s/Dsr2|=0.12.

In the imaging lens assembly according to the 1st embodiment, when thefocal length of the imaging lens assembly is f, a focal length of thefirst lens element 110 is f1, a focal length of the second lens element120 is f2, a focal length of the third lens element 130 is f3, a focallength of the fourth lens element 140 is f4, a focal length of the fifthlens element 150 is f5, the following conditions are satisfied:|f1/f2|=1.14; |f1/f3|=0.26; f4/f5=−1.15; f/f3=−0.17; |f/f4|+|f/f5|=2.45;and (f/f4)−(f/f5)=−2.45.

In the imaging lens assembly according to the 1st embodiment, when anaxial distance between the object-side surface 111 of the first lenselement 110 and the image surface 170 is TL, a maximum image height ofthe imaging lens assembly is ImgH (half of a diagonal length of aneffective photosensitive area of the image sensor 180), and the half ofa maximum field of view of the imaging lens assembly is HFOV, thefollowing conditions are satisfied: TL/ImgH=1.51; andTL/ImgH+1/tan(HFOV)=2.43.

In the imaging lens assembly according to the 1st embodiment, when thefocal length of the imaging lens assembly is f, and a maximum opticaleffective radius of the image-side surface 152 of the fifth lens element150 is Y52, the following condition is satisfied: f/Y52=1.16.

The detailed optical data of the 1st embodiment are shown in Table 1 andthe aspheric surface data are shown in Table 2 below.

TABLE 1 1st Embodiment f = 2.19 mm, Fno = 2.25, HFOV = 47.5 deg. FocalSurface # Curvature Radius Thickness Material Index Abbe # Length 0Object Plano Infinity 1 Ape. Stop Plano −0.040  2 Lens 1 1.619 ASP 0.380Plastic 1.545 56.1 3.30 3 15.067 ASP −0.001  4 Stop Plano 0.181 5 Lens 2−4.555 ASP 0.534 Plastic 1.544 56.0 2.89 6 −1.219 ASP 0.231 7 Lens 3−0.450 ASP 0.300 Plastic 1.669 19.5 −12.61 8 −0.603 ASP 0.030 9 Lens 41.379 ASP 0.300 Plastic 1.660 20.4 −1.92 10 0.603 ASP 0.030 11 Lens 50.608 ASP 0.532 Plastic 1.544 56.0 1.67 12 1.271 ASP 0.400 13 IR-cutfilter Plano 0.210 Glass 1.517 64.2 — 14 Plano 0.303 15 Image Plano —Reference wavelength is 587.6 nm (d-line). Effective radius of Surface 4is 0.560 mm.

TABLE 2 Aspheric Coefficients Surface # 2 3 5 6 7 k =  1.0193E+00−5.5328E+01 −6.8970E+01 −1.8357E+01 −2.1587E+00 A4 = −1.0616E−01−3.0635E−01 −5.0290E−01 −1.3527E+00 −6.0083E−01 A6 = −2.9045E−01−8.7079E−01 −2.5805E+00  2.4869E+00 −3.8188E−01 A8 =  8.4706E−01 5.1068E−01  1.1665E+01 −7.8283E+00  3.1917E+00 A10 = −4.4226E+00−4.7947E+00 −5.6171E+01  1.3772E+01 −2.6863E+00 A12 =  8.8610E+01−1.0186E+01  4.1700E−01 A14 = −4.1566E+01  2.5862E+00  1.9772E−01 A16 =−4.7768E−02 Surface # 8 9 10 11 12 k = −2.1910E+00 −2.3965E+00−5.3020E+00 −4.8161E+00 −7.7491E+00 A4 = −2.2544E−01 −5.6143E−01−2.8060E−01 −2.0612E−01 −3.4072E−02 A6 = −3.0028E−01  8.4651E−01 2.6643E−01  8.5384E−02 −2.5672E−02 A8 =  2.0542E+00 −1.2130E+00−2.4326E−01 −3.3996E−02  2.2341E−02 A10 = −2.9702E+00  1.1020E+00 1.3512E−01  1.5832E−02 −7.9231E−03 A12 =  1.5580E+00 −6.6753E−01−4.2107E−02 −4.6383E−03  1.1257E−03 A14 =  2.3568E−01  7.0179E−03 7.0803E−04 −1.6041E−05 A16 = −3.2583E−02 −4.9002E−04 −4.5463E−05−5.6953E−06

In Table 1, the curvature radius, the thickness and the focal length areshown in millimeters (mm). Surface numbers 0-15 represent the surfacessequentially arranged from the object side to the image side along theoptical axis. In Table 2, k represents the conic coefficient of theequation of the aspheric surface profiles. A4-A16 represent the asphericcoefficients ranging from the 4th order to the 16th order. The tablespresented below for each embodiment correspond to schematic parameterand aberration curves of each embodiment, and term definitions of thetables are the same as those in Table 1 and Table 2 of the 1stembodiment. Therefore, an explanation in this regard will not beprovided again.

Furthermore, in the imaging lens assembly according to the 1stembodiment, when the focal length of the first lens element 110 is f1,the focal length of the second lens element 120 is f2, the focal lengthof the third lens is element 130 is f3, the focal length of the fourthlens element 140 is f4, and the focal length of the fifth lens element150 is f5, the following conditions are satisfied: |f4|<|f1|<|f3|;|f5|<|f1|<|f3|; |f4|<|f2|<|f3|; and |f5|<|f2|<|f3|.

2nd Embodiment

FIG. 3 is a schematic view of an imaging apparatus according to the 2ndembodiment of the present disclosure. FIG. 4 shows spherical aberrationcurves, astigmatic field curves and a distortion curve of the imagingapparatus according to the 2nd embodiment. In FIG. 3, the imagingapparatus includes an imaging lens assembly (its reference numeral isomitted) and an image sensor 280. The imaging lens assembly includes, inorder from an object side to an image side, a first lens element 210, anaperture stop 200, a second lens element 220, a third lens element 230,a fourth lens element 240, a fifth lens element 250, an IR-cut filter260 and an image surface 270, wherein the image sensor 280 is disposedon the image surface 270 of the imaging lens assembly. The imaging lensassembly includes five lens elements (210, 220, 230, 240 and 250)without additional one or more lens elements inserted between the firstlens element 210 and the fifth lens element 250.

The first lens element 210 with positive refractive power has anobject-side surface 211 being convex in a paraxial region thereof and animage-side surface 212 being concave in a paraxial region thereof. Thefirst lens element 210 is made of a plastic material, and has theobject-side surface 211 and the image-side surface 212 being bothaspheric. Furthermore, the image-side surface 212 of the first lenselement 210 includes at least one convex critical point in an off-axisregion thereof.

The second lens element 220 with positive refractive power has anobject-side surface 221 being concave in a paraxial region thereof andan image-side surface 222 being convex in a paraxial region thereof. Thesecond lens element 220 is made of a plastic material, and has theobject-side surface 221 and the image-side surface 222 being bothaspheric.

The third lens element 230 with negative refractive power has anobject-side surface 231 being concave in a paraxial region thereof andan image-side surface 232 being convex in a paraxial region thereof. Thethird lens element 230 is made of a plastic material, and has theobject-side surface 231 and the image-side surface 232 being bothaspheric.

The fourth lens element 240 with negative refractive power has anobject-side surface 241 being convex in a paraxial region thereof and animage-side surface 242 being concave in a paraxial region thereof. Thefourth lens element 240 is made of a plastic material, and has theobject-side surface 241 and the image-side surface 242 being bothaspheric. Furthermore, the object-side surface 241 of the fourth lenselement 240 includes at least one concave critical point in an off-axisregion thereof, and the image-side surface 242 of the fourth lenselement 240 includes at least one convex critical point in an off-axisregion thereof.

The fifth lens element 250 with positive refractive power has anobject-side surface 251 being convex in a paraxial region thereof and animage-side surface 252 being concave in a paraxial region thereof. Thefifth lens element 250 is made of a plastic material, and has theobject-side surface 251 and the image-side surface 252 being bothaspheric. Furthermore, the image-side surface 252 of the fifth lenselement 250 includes at least one convex critical point in an off-axisregion thereof.

The IR-cut filter 260 is made of a glass material and located betweenthe fifth lens element 250 and the image surface 270, and will notaffect the focal length of the imaging lens assembly.

The detailed optical data of the 2nd embodiment are shown in Table 3 andthe aspheric surface data are shown in Table 4 below.

TABLE 3 2nd Embodiment f = 2.18 mm, Fno = 2.22, HFOV = 47.5 deg. FocalSurface # Curvature Radius Thickness Material Index Abbe # Length 0Object Plano Infinity 1 Lens 1 2.140 ASP 0.259 Plastic 1.545 56.0 4.39 219.526 ASP −0.019  3 Ape. Stop Plano 0.271 4 Lens 2 −12.963 ASP 0.465Plastic 1.544 55.9 2.93 5 −1.438 ASP 0.374 6 Lens 3 −0.395 ASP 0.250Plastic 1.669 19.5 −5.43 7 −0.556 ASP 0.030 8 Lens 4 1.202 ASP 0.250Plastic 1.669 19.5 −2.37 9 0.627 ASP 0.030 10 Lens 5 0.615 ASP 0.527Plastic 1.544 56.0 1.49 11 1.770 ASP 0.500 12 IR-cut filter Plano 0.210Glass 1.517 64.2 — 13 Plano 0.310 14 Image Plano — Reference wavelengthis 587.6 nm (d-line).

TABLE 4 Aspheric Coefficients Surface # 1 2 4 5 6 k =  1.0193E+00−5.5328E+01 −6.8970E+01 −1.8357E+01 −2.0656E+00 A4 = −3.5029E−01−2.1963E−01 −3.7530E−01 −1.1565E+00 −1.6136E+00 A6 =  2.4744E+00−4.8750E+00 −2.1201E+00  1.8765E+00  4.8876E+00 A8 = −3.3806E+01 5.8692E+01  1.5606E+01 −5.2548E+00 −9.8214E+00 A10 =  2.1620E+02−4.3839E+02 −8.5416E+01  5.6102E+00  1.3130E+01 A12 = −7.8419E+02 1.8034E+03  2.1146E+02  5.5010E−01 −9.3042E+00 A14 =  1.4684E+03−3.8245E+03 −2.1981E+02 −3.5654E+00  3.0607E+00 A16 = −1.1088E+03 3.2696E+03  7.9455E+01  1.2957E+00 −3.6331E−01 Surface # 7 8 9 10 11 k= −1.8480E+00 −1.5852E+00 −5.3020E+00 −4.8161E+00 −7.7491E+00 A4 =−3.8343E−01 −4.4949E−01 −7.2293E−02 −7.8658E−02 −4.9399E−02 A6 = 3.7815E−01  7.1821E−01 −1.3331E−01 −1.2854E−01  9.1664E−03 A8 = 1.0296E+00 −1.2837E+00  1.5301E−01  1.8751E−01  8.9257E−03 A10 =−2.0284E+00  1.4665E+00 −9.8596E−02 −1.0365E−01 −6.4680E−03 A12 = 7.0802E−01 −1.0333E+00  3.3217E−02  2.8523E−02  1.5494E−03 A14 = 4.4603E−01  3.6909E−01 −5.0713E−03 −3.8485E−03 −1.6927E−04 A16 =−1.1045E−01 −4.7929E−02  2.6498E−04  2.0051E−04  7.3464E−06

In the 2nd embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment withcorresponding values for the 2nd embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 3 and Table 4 asthe following values and satisfy the following conditions:

2nd Embodiment f [mm] 2.18 |f1/f2| 1.50 Fno 2.22 |f1/f3| 0.81 HFOV[deg.] 47.5 f4/f5 −1.59 FOV [deg.] 95.00 f/f3 −0.40 (V1 + V2)/(V3 + V4)2.87 |f/f4| + |f/f5| 2.38 V3 + V4 39.0 (f/f4) − (f/f5) −2.38 (R3 +R4)/(R3 − R4) 1.25 TL/ImgH 1.52 (|R5| + |R6|)/f 0.44 TL/ImgH +1/tan(HFOV) 2.44 (|R7| + |R8|)/f 0.84 f/Y52 1.14 |Dr1s/Dsr2| 12.63

Furthermore, in the imaging lens assembly according to the 2ndembodiment, when the focal length of the first lens element 210 is f1,the focal length of the second lens element 220 is f2, the focal lengthof the third lens element 230 is f3, the focal length of the fourth lenselement 240 is f4, and the focal length of the fifth lens element 250 isf5, the following conditions are satisfied: |f4|<|f1|<|f3|;|f5|<|f1|<|f3|; |f4|<|f2|<|f3|; and |f5|<|f2|<|f3|.

3rd Embodiment

FIG. 5 is a schematic view of an imaging apparatus according to the 3rdembodiment of the present disclosure. FIG. 6 shows spherical aberrationcurves, astigmatic field curves and a distortion curve of the imagingapparatus according to the 3rd embodiment. In FIG. 5, the imagingapparatus includes an imaging lens assembly (its reference numeral isomitted) and an image sensor 380. The imaging lens assembly includes, inorder from an object side to an image side, an aperture stop 300, afirst lens element 310, a stop 301, a second lens element 320, a thirdlens element 330, a fourth lens element 340, a fifth lens element 350,an IR-cut filter 360 and an image surface 370, wherein the image sensor380 is disposed on the image surface 370 of the imaging lens assembly.The imaging lens assembly includes five lens elements (310, 320, 330,340 and 350) without additional one or more lens elements insertedbetween the first lens element 310 and the fifth lens element 350.

The first lens element 310 with positive refractive power has anobject-side surface 311 being convex in a paraxial region thereof and animage-side surface 312 being convex in a paraxial region thereof. Thefirst lens element 310 is made of a plastic material, and has theobject-side surface 311 and the image-side surface 312 being bothaspheric.

The second lens element 320 with positive refractive power has anobject-side surface 321 being concave in a paraxial region thereof andan image-side surface 322 being convex in a paraxial region thereof. Thesecond lens element 320 is made of a plastic material, and has theobject-side surface 321 and the image-side surface 322 being bothaspheric.

The third lens element 330 with positive refractive power has anobject-side surface 331 being concave in a paraxial region thereof andan image-side surface 332 being convex in a paraxial region thereof. Thethird lens element 330 is made of a plastic material, and has theobject-side surface 331 and the image-side surface 332 being bothaspheric.

The fourth lens element 340 with negative refractive power has anobject-side surface 341 being convex in a paraxial region thereof and animage-side surface 342 being concave in a paraxial region thereof. Thefourth lens element 340 is made of a plastic material, and has theobject-side surface 341 and the image-side surface 342 being bothaspheric. Furthermore, the object-side surface 341 of the fourth lenselement 340 includes at least one concave critical point in an off-axisregion thereof, and the image-side surface 342 of the fourth lenselement 340 includes at least one convex critical point in an off-axisregion thereof.

The fifth lens element 350 with positive refractive power has anobject-side surface 351 being convex in a paraxial region thereof and animage-side surface 352 being concave in a paraxial region thereof. Thefifth lens element 350 is made of a plastic material, and has theobject-side surface 351 and the image-side surface 352 being bothaspheric. Furthermore, the image-side surface 352 of the fifth lenselement 350 includes at least one convex critical point in an off-axisregion thereof.

The IR-cut filter 360 is made of a glass material and located betweenthe fifth lens element 350 and the image surface 370, and will notaffect the focal length of the imaging lens assembly.

The detailed optical data of the 3rd embodiment are shown in Table 5 andthe aspheric surface data are shown in Table 6 below.

TABLE 5 3rd Embodiment f = 2.09 mm, Fno = 2.25, HFOV = 50.0 deg. FocalSurface # Curvature Radius Thickness Material Index Abbe # Length 0Object Plano Infinity 1 Ape. Stop Plano −0.012  2 Lens 1 2.009 ASP 0.330Plastic 1.544 55.9 2.94 3 −7.407 ASP 0.002 4 Stop Plano 0.176 5 Lens 2−2.992 ASP 0.565 Plastic 1.544 55.9 3.24 6 −1.183 ASP 0.155 7 Lens 3−0.475 ASP 0.302 Plastic 1.660 20.4 16.93 8 −0.571 ASP 0.030 9 Lens 41.594 ASP 0.300 Plastic 1.660 20.4 −1.44 10 0.551 ASP 0.034 11 Lens 50.562 ASP 0.500 Plastic 1.544 55.9 1.47 12 1.299 ASP 0.500 13 IR-cutfilter Plano 0.210 Glass 1.517 64.2 — 14 Plano 0.293 15 Image Plano —Reference wavelength is 587.6 nm (d-line). Effective radius of Surface 4is 0.560 mm.

TABLE 6 Aspheric Coefficients Surface # 2 3 5 6 7 k =  8.5017E−01−6.7961E+01 −7.7490E+01 −1.9667E+01 −1.9727E+00 A4 = −1.5778E−01−4.3776E−01 −8.5737E−01 −1.5214E+00 −1.0923E+00 A6 = −7.1393E−01−9.6072E−01  9.3357E−02  2.1848E+00  2.4193E+00 A8 =  2.4351E+00 9.8665E−02  5.5133E−01 −1.6514E+00 −1.6779E+00 A10 = −1.1072E+01−2.9407E+00 −2.5748E+01 −7.3809E−01  1.6013E+00 A12 =  5.8337E+01 1.5877E+00 −1.8571E+00 A14 = −3.2228E+01 −5.1284E−01  8.5569E−01 A16 =−1.2251E−01 Surface # 8 9 10 11 12 k = −2.7726E+00 −1.0000E+00−5.2535E+00 −4.8179E+00 −8.1416E+00 A4 = −7.2731E−01 −2.1920E−01−1.3316E−01 −1.8894E−01 −6.3544E−03 A6 =  1.5257E+00 −2.7033E−01−1.1803E−01  1.1186E−01 −2.6860E−02 A8 = −1.8504E+00  3.9291E−01 2.2550E−01 −6.6405E−02  7.0059E−03 A10 =  1.7061E+00 −1.9076E−01−1.5062E−01  3.1729E−02  9.5399E−04 A12 = −5.5031E−01  1.7820E−02 5.1920E−02 −8.7741E−03 −9.9659E−04 A14 =  1.2101E−02 −9.0997E−03 1.2380E−03  2.1521E−04 A16 = −2.6620E−03  6.2899E−04 −6.9806E−05−1.4900E−05

In the 3rd embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment withcorresponding values for the 3rd embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 5 and Table 6 asthe following values and satisfy the following conditions:

3rd Embodiment f [mm] 2.09 |f1/f2| 0.91 Fno 2.25 |f1/f3| 0.17 HFOV[deg.] 50.0 f4/f5 −0.98 FOV [deg.] 100.00 f/f3 0.12 (V1 + V2)/(V3 + V4)2.74 |f/f4| + |f/f5| 2.87 V3 + V4 40.8 (f/f4) − (f/f5) −2.87 (R3 +R4)/(R3 − R4) 2.31 TL/ImgH 1.50 (|R5| + |R6|)/f 0.50 TL/ImgH +1/tan(HFOV) 2.34 (|R7| + |R8|)/f 1.03 f/Y52 1.10 |Dr1s/Dsr2| 0.04

Furthermore, in the imaging lens assembly according to the 3rdembodiment, when the focal length of the first lens element 310 is f1,the focal length of the second lens element 320 is f2, the focal lengthof the third lens element 330 is f3, the focal length of the fourth lenselement 340 is f4, and the focal length of the fifth lens element 350 isf5, the following conditions are satisfied: |f4|<|f1|<|f3|; |f5|<<|f3|;|f4|<|f2|<|f3|; and |f5|<|f2|<|f3|.

4th Embodiment

FIG. 7 is a schematic view of an imaging apparatus according to the 4thembodiment of the present disclosure. FIG. 8 shows spherical aberrationcurves, astigmatic field curves and a distortion curve of the imagingapparatus according to the 4th embodiment. In FIG. 7, the imagingapparatus includes an imaging lens assembly (its reference numeral isomitted) and an image sensor 480. The imaging lens assembly includes, inorder from an object side to an image side, a first lens element 410, anaperture stop 400, a second lens element 420, a third lens element 430,a fourth lens element 440, a fifth lens element 450, an IR-cut filter460 and an image surface 470, wherein the image sensor 480 is disposedon the image surface 470 of the imaging lens assembly. The imaging lensassembly includes five lens elements (410, 420, 430, 440 and 450)without additional one or more lens elements inserted between the firstlens element 410 and the fifth lens element 450.

The first lens element 410 with positive refractive power has anobject-side surface 411 being convex in a paraxial region thereof and animage-side surface 412 being concave in a paraxial region thereof. Thefirst lens element 410 is made of a plastic material, and has theobject-side surface 411 and the image-side surface 412 being bothaspheric. Furthermore, the image-side surface 412 of the first lenselement 410 includes at least one convex critical point in an off-axisregion thereof.

The second lens element 420 with positive refractive power has anobject-side surface 421 being convex in a paraxial region thereof and animage-side surface 422 being convex in a paraxial region thereof. Thesecond lens element 420 is made of a plastic material, and has theobject-side surface 421 and the image-side surface 422 being bothaspheric.

The third lens element 430 with negative refractive power has anobject-side surface 431 being concave in a paraxial region thereof andan image-side surface 432 being convex in a paraxial region thereof. Thethird lens element 430 is made of a plastic material, and has theobject-side surface 431 and the image-side surface 432 being bothaspheric.

The fourth lens element 440 with negative refractive power has anobject-side surface 441 being convex in a paraxial region thereof and animage-side surface 442 being concave in a paraxial region thereof. Thefourth lens element 440 is made of a plastic material, and has theobject-side surface 441 and the image-side surface 442 being bothaspheric. Furthermore, the object-side surface 441 of the fourth lenselement 440 includes at least one concave critical point in an off-axisregion thereof, and the image-side surface 442 of the fourth lenselement 440 includes at least one convex critical point in an off-axisregion thereof.

The fifth lens element 450 with positive refractive power has anobject-side surface 451 being convex in a paraxial region thereof and animage-side surface 452 being concave in a paraxial region thereof. Thefifth lens element 450 is made of a plastic material, and has theobject-side surface 451 and the image-side surface 452 being bothaspheric. Furthermore, the image-side surface 452 of the fifth lenselement 450 includes at least one convex critical point in an off-axisregion thereof.

The IR-cut filter 460 is made of a glass material and located betweenthe fifth lens element 450 and the image surface 470, and will notaffect the focal length of the imaging lens assembly.

The detailed optical data of the 4th embodiment are shown in Table 7 andthe aspheric surface data are shown in Table 8 below.

TABLE 7 4th Embodiment f = 2.18 mm, Fno = 2.20, HFOV = 47.5 deg. FocalSurface # Curvature Radius Thickness Material Index Abbe # Length 0Object Plano Infinity 1 Lens 1 2.297 ASP 0.252 Plastic 1.545 56.0 4.49 235.971 ASP −0.026  3 Ape. Stop Plano 0.291 4 Lens 2 45.224 ASP 0.456Plastic 1.544 55.9 2.87 5 −1.610 ASP 0.348 6 Lens 3 −0.394 ASP 0.270Plastic 1.669 19.5 −5.67 7 −0.560 ASP 0.030 8 Lens 4 1.114 ASP 0.250Plastic 1.669 19.5 −2.32 9 0.591 ASP 0.030 10 Lens 5 0.631 ASP 0.580Plastic 1.544 55.9 1.49 11 1.944 ASP 0.500 12 IR-cut filter Plano 0.145Glass 1.517 64.2 — 13 Plano 0.328 14 Image Plano — Reference wavelengthis 587.6 nm (d-line).

TABLE 8 Aspheric Coefficients Surface # 1 2 4 5 6 k =  1.0195E+00−5.5328E+01 −6.8970E+01 −1.8357E+01 −2.1022E+00 A4 = −4.1061E−01−3.2650E−01 −3.7354E−01 −9.1364E−01 −1.0263E+00 A6 =  2.6601E+00−3.2278E+00 −1.6940E+00  4.6751E−01  8.8212E−02 A8 = −3.5769E+01 3.0443E+01  1.3226E+01 −1.1267E−01  6.1714E+00 A10 =  2.2211E+02−1.8701E+02 −7.3661E+01 −6.1266E+00 −1.3377E+01 A12 = −7.8633E+02 6.0612E+02  1.9103E+02  1.7026E+01  1.1481E+01 A14 =  1.4478E+03−9.1001E+02 −2.0478E+02 −1.4834E+01 −4.2062E+00 A16 = −1.0779E+03 4.3713E+02  7.4902E+01  4.0925E+00  5.3353E−01 Surface # 7 8 9 10 11 k= −1.8542E+00 −1.8563E+00 −5.3020E+00 −4.8161E+00 −7.7491E+00 A4 = 7.5886E−02 −5.5397E−01 −7.9876E−02 −8.1130E−02 −3.3001E−02 A6 =−2.2439E+00  8.9419E−01 −1.5218E−01 −7.4025E−02  2.1171E−04 A8 = 7.9854E+00 −1.4181E+00  2.1200E−01  1.1499E−01  8.0331E−03 A10 =−1.2587E+01  1.5052E+00  −15449E−01 −6.6046E−02 −5.2279E−03 A12 = 1.0656E+01 −1.0146E+00  5.9576E−02  1.9027E−02  1.3501E−03 A14 =−5.4060E+00  3.5688E−01 −1.1074E−02 −2.6714E−03 −1.7099E−04 A16 = 1.5214E+00 −4.6742E−02  7.8376E−04  1.4272E−04  8.8369E−06

In the 4th embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment withcorresponding values for the 4th embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 7 and Table 8 asthe following values and satisfy the following conditions:

4th Embodiment f [mm] 2.18 |f1/f2| 1.56 Fno 2.20 |f1/f3| 0.79 HFOV[deg.] 47.5 f4/f5 −1.56 FOV [deg.] 95.00 f/f3 −0.38 (V1 + V2)/(V3 + V4)2.87 |f/f4| + |f/f5| 2.40 V3 + V4 39.0 (f/f4) − (f/f5) −2.40 (R3 +R4)/(R3 − R4) 0.93 TL/ImgH 1.52 (|R5| + |R6|)/f 0.44 TL/ImgH +1/tan(HFOV) 2.44 (|R7| + |R8|)/f 0.78 f/Y52 1.15 |Dr1s/Dsr2| 8.69

Furthermore, in the imaging lens assembly according to the 4thembodiment, when the focal length of the first lens element 410 is f1,the focal length of the second lens element 420 is f2, the focal lengthof the third lens element 430 is f3, the focal length of the fourth lenselement 440 is f4, and the focal length of the fifth lens element 450 isf5, the following conditions are satisfied: |f4|<|f1|<|f3|;|f5|<|f1|<|f3|; |f4|<|f2|<|f3|; and |f5|<|f2|<|f3|.

5th Embodiment

FIG. 9 is a schematic view of an imaging apparatus according to the 5thembodiment of the present disclosure. FIG. 10 shows spherical aberrationcurves, astigmatic field curves and a distortion curve of the imagingapparatus according to the 5th embodiment. In FIG. 9, the imagingapparatus includes an imaging lens assembly (its reference numeral isomitted) and an image sensor 580. The imaging lens assembly includes, inorder from an object side to an image side, an aperture stop 500, afirst lens element 510, a second lens element 520, a third lens element530, a fourth lens element 540, a fifth lens element 550, an IR-cutfilter 560 and an image surface 570, wherein the image sensor 580 isdisposed on the image surface 570 of the imaging lens assembly. Theimaging lens assembly includes five lens elements (510, 520, 530, 540and 550) without additional one or more lens elements inserted betweenthe first lens element 510 and the fifth lens element 550.

The first lens element 510 with positive refractive power has anobject-side surface 511 being convex in a paraxial region thereof and animage-side surface 512 being concave in a paraxial region thereof. Thefirst lens element 510 is made of a plastic material, and has theobject-side surface 511 and the image-side surface 512 being bothaspheric. Furthermore, the image-side surface 512 of the first lenselement 510 includes at least one convex critical point in an off-axisregion thereof.

The second lens element 520 with positive refractive power has anobject-side surface 521 being concave in a paraxial region thereof andan image-side surface 522 being convex in a paraxial region thereof. Thesecond lens element 520 is made of a plastic material, and has theobject-side surface 521 and the image-side surface 522 being bothaspheric.

The third lens element 530 with negative refractive power has anobject-side surface 531 being concave in a paraxial region thereof andan image-side surface 532 being convex in a paraxial region thereof. Thethird lens element 530 is made of a plastic material, and has theobject-side surface 531 and the image-side surface 532 being bothaspheric.

The fourth lens element 540 with negative refractive power has anobject-side surface 541 being convex in a paraxial region thereof and animage-side surface 542 being concave in a paraxial region thereof. Thefourth lens element 540 is made of a plastic material, and has theobject-side surface 541 and the image-side surface 542 being bothaspheric. Furthermore, the object-side surface 541 of the fourth lenselement 540 includes at least one concave critical point in an off-axisregion thereof, and the image-side surface 542 of the fourth lenselement 540 includes at least one convex critical point in an off-axisregion thereof.

The fifth lens element 550 with positive refractive power has anobject-side surface 551 being convex in a paraxial region thereof and animage-side surface 552 being concave in a paraxial region thereof. Thefifth lens element 550 is made of a plastic material, and has theobject-side surface 551 and the image-side surface 552 being bothaspheric. Furthermore, the image-side surface 552 of the fifth lenselement 550 includes at least one convex critical point in an off-axisregion thereof.

The IR-cut filter 560 is made of a glass material and located betweenthe fifth lens element 550 and the image surface 570, and will notaffect the focal length of the imaging lens assembly.

The detailed optical data of the 5th embodiment are shown in Table 9 andthe aspheric surface data are shown in Table 10 below.

TABLE 9 5th Embodiment f = 2.13 mm, Fno = 2.20, HFOV = 47.5 deg. FocalSurface # Curvature Radius Thickness Material Index Abbe # Length 0Object Plano Infinity 1 Ape. Stop Plano −0.070  2 Lens 1 1.288 ASP 0.327Plastic 1.544 55.9 3.20 3 4.504 ASP 0.179 4 Lens 2 −8.302 ASP 0.362Plastic 1.511 56.8 3.65 5 −1.547 ASP 0.223 6 Lens 3 −0.473 ASP 0.271Plastic 1.669 19.5 −7.34 7 −0.644 ASP 0.030 8 Lens 4 1.268 ASP 0.222Plastic 1.669 19.5 −2.47 9 0.667 ASP 0.030 10 Lens 5 0.595 ASP 0.446Plastic 1.544 55.9 1.72 11 1.195 ASP 0.400 12 IR-cut filter Plano 0.145Glass 1.517 64.2 — 13 Plano 0.466 14 Image Plano — Reference wavelengthis 587.6 nm (d-line).

TABLE 10 Aspheric Coefficients Surface # 2 3 4 5 6 k =  9.8559E−01−5.5328E+01 −6.8970E+01 −1.8365E+01 −2.4573E+00 A4 = −4.4900E−01−1.7498E−02 −2.1518E−01 −9.1472E−01 −6.6745E−01 A6 =  8.3355E+00−3.3776E+00 −7.1022E+00 −2.3392E−01 −5.5249E+00 A8 = −1.2012E+02 1.7647E+01  5.7429E+01 −2.8998E+00  3.7948E+01 A10 =  9.4253E+02−7.3105E+01 −3.1197E+02  1.9931E+01 −8.3454E+01 A12 = −4.2395E+03 1.4205E+02  8.1693E+02 −3.8358E+01  7.7365E+01 A14 =  1.0133E+04−1.3223E+02 −9.0772E+02  3.0028E+01 −3.0400E+01 A16 = −1.0048E+04 8.6766E+01  3.4741E+02 −8.1844E+00  4.0495E+00 Surface # 7 8 9 10 11 k= −1.8709E+00 −7.0176E+00 −5.1196E+00 −4.8061E+00 −7.8490E+00 A4 =−7.9434E−01 −1.1222E+00 −8.2539E−01 −2.0392E−01  3.9592E−02 A6 = 2.0191E+00  3.2949E+00  1.8658E+00  1.9965E−01 −2.2527E−01 A8 =−5.0517E+00 −5.8892E+00 −2.5807E+00 −2.0693E−01  2.2652E−01 A10 = 2.2733E+01  5.7294E+00  1.9403E+00  1.2776E−01 −1.1518E−01 A12 =−5.1827E+01 −3.1527E+00 −7.8409E−01 −4.1455E−02  3.0891E−02 A14 = 5.1039E+01  9.3611E−01  1.5883E−01  6.7079E−03 −4.1233E−03 A16 =−1.7360E+01 −1.1425E−01 −1.2607E−02 −4.2938E−04  2.1562E−04

In the 5th embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment withcorresponding values for the 5th embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 9 and Table 10as the following values and satisfy the following conditions:

5th Embodiment f [mm] 2.13 |f1/f2| 0.88 Fno 2.20 |f1/f3| 0.44 HFOV[deg.] 47.5 f4/f5 −1.44 FOV [deg.] 95.00 f/f3 −0.29 (V1 + V2)/(V3 + V4)2.89 |f/f4| + |f/f5| 2.10 V3 + V4 39.0 (f/f4) − (f/f5) −2.10 (R3 +R4)/(R3 − R4) 1.46 TL/ImgH 1.37 (|R5| + |R6|)/f 0.52 TL/ImgH +1/tan(HFOV) 2.28 (|R7| + |R8|)/f 0.91 f/Y52 1.20 |Dr1s/Dsr2| 0.27

Furthermore, in the imaging lens assembly according to the 5thembodiment, when the focal length of the first lens element 510 is ftthe focal length of the second lens element 520 is f2, the focal lengthof the third lens element 530 is f3, the focal length of the fourth lenselement 540 is f4, and the focal length of the fifth lens element 550 isf5, the following conditions are satisfied: |f4|<|f1|<|f3|;|f5|<|f1|<|f3|; |f4|<|f2|<|f3|; and |f5|<|f2|<|f3|.

6th Embodiment

FIG. 11 is a schematic view of an imaging apparatus according to the 6thembodiment of the present disclosure. FIG. 12 shows spherical aberrationcurves, astigmatic field curves and a distortion curve of the imagingapparatus according to the 6th embodiment. In FIG. 11, the imagingapparatus includes an imaging lens assembly (its reference numeral isomitted) and an image sensor 680. The imaging lens assembly includes, inorder from an object side an image side, an aperture stop 600, a firstlens element 610, a second lens element 620, a third lens element 630, afourth lens element 640, a fifth lens element 650, an IR-cut filter 660and an image surface 670, wherein the image sensor 680 is disposed onthe image surface 670 of the imaging lens assembly. The imaging lensassembly includes five lens elements (610, 620, 630, 640 and 650)without additional one or more lens elements inserted between the firstlens element 610 and the fifth lens element 650.

The first lens element 610 with positive refractive power has anobject-side surface 611 being convex in a paraxial region thereof and animage-side surface 612 being planar in a paraxial region thereof. Thefirst lens element 610 is made of a plastic material, and has theobject-side surface 611 and the image-side surface 612 being bothaspheric.

The second lens element 620 with positive refractive power has anobject-side surface 621 being concave in a paraxial region thereof andan image-side surface 622 being convex in a paraxial region thereof. Thesecond lens element 620 is made of a plastic material, and has theobject-side surface 621 and the image-side surface 622 being bothaspheric.

The third lens element 630 with positive refractive power has anobject-side surface 631 being concave in a paraxial region thereof andan image-side surface 632 being convex in a paraxial region thereof. Thethird lens element 630 is made of a plastic material, and has theobject-side surface 631 and the image-side surface 632 being bothaspheric.

The fourth lens element 640 with negative refractive power has anobject-side surface 641 being convex in a paraxial region thereof and animage-side surface 642 being concave in a paraxial region thereof. Thefourth lens element 640 is made of a plastic material, and has theobject-side surface 641 and the image-side surface 642 being bothaspheric. Furthermore, the object-side surface 641 of the fourth lenselement 640 includes at least one concave critical point in an off-axisregion thereof, and the image-side surface 642 of the fourth lenselement 640 includes at least one convex critical point in an off-axisregion thereof.

The fifth lens element 650 with positive refractive power has anobject-side surface 651 being convex in a paraxial region thereof and animage-side surface 652 being concave in a paraxial region thereof. Thefifth lens element 650 is made of a plastic material, and has theobject-side surface 651 and the image-side surface 652 being bothaspheric. Furthermore, the image-side surface 652 of the fifth lenselement 650 includes at least one convex critical point in an off-axisregion thereof.

The IR-cut filter 660 is made of a glass material and located betweenthe fifth lens element 650 and the image surface 670, and will notaffect the focal length of the imaging lens assembly.

The detailed optical data of the 6th embodiment are shown in Table 11and the aspheric surface data are shown in Table 12 below.

TABLE 11 6th Embodiment f = 2.24 mm, Fno = 2.12, HFOV = 45.4 deg. FocalSurface # Curvature Radius Thickness Material Index Abbe # Length 0Object Plano Infinity 1 Ape. Stop Plano −0.050  2 Lens 1 1.644 ASP 0.389Plastic 1.544 55.9 3.02 3 ∞ ASP 0.206 4 Lens 2 −4.111 ASP 0.516 Plastic1.511 56.8 4.23 5 −1.476 ASP 0.165 6 Lens 3 −0.546 ASP 0.339 Plastic1.669 19.5 36.12 7 −0.667 ASP 0.030 8 Lens 4 1.369 ASP 0.200 Plastic1.669 19.5 −1.82 9 0.606 ASP 0.030 10 Lens 5 0.597 ASP 0.493 Plastic1.544 55.9 1.70 11 1.194 ASP 0.500 12 IR-cut filter Plano 0.300 Glass1.517 64.2 — 13 Plano 0.326 14 Image Plano — Reference wavelength is587.6 nm (d-line).

TABLE 12 Aspheric Coefficients Surface # 2 3 4 5 6 k =  1.6445E+00 0.0000E+00 −3.9670E+01 −1.5776E+01 −2.3584E+00 A4 = −1.8976E−01−2.3426E−01 −6.1748E−01 −1.4120E+00 −1.8104E+00 A6 =  3.9351E−01−5.6776E−01  1.3706E+00  3.1408E+00  6.6705E+00 A8 =  1.7740E+00−4.6630E+00 −1.9664E+01 −8.7572E+00 −1.5633E+01 A10 = −4.8008E+01 5.0270E+01  1.1003E+02  1.4966E+01  2.1969E+01 A12 =  2.2560E+02−2.4170E+02 −3.7929E+02 −1.2781E+01 −1.5686E+01 A14 = −4.1933E+02 5.2919E+02  6.9021E+02  5.1882E+00  5.1344E+00 A16 =  2.2560E+02−4.4689E+02 −5.0075E+02 −8.0166E−01 −6.0533E−01 Surface # 7 8 9 10 11 k= −1.7053E+00 −2.6152E+00 −3.6124E+00 −4.0746E+00 −7.2224E+00 A4 =−4.8780E−01 −3.1367E−01 −4.5464E−01 −2.9623E−01 −5.5188E−02 A6 = 1.6390E+00  3.8325E−02  5.9928E−01  2.8802E−01  3.7160E−03 A8 =−3.0115E+00  3.1383E−01 −6.9400E−01 −2.1759E−01  1.4945E−02 A10 = 4.1132E+00 −8.3631E−01  4.9198E−01  1.2059E−01 −1.2564E−02 A12 =−4.4031E+00  8.3181E−01 −1.9378E−01 −4.5065E−02  4.2009E−03 A14 = 3.0896E+00 −3.5389E−01  3.8947E−02  9.2958E−03 −7.0667E−04 A16 =−8.5153E−01  5.1955E−02 −3.1018E−03 −7.6502E−04  4.7235E−05

In the 6th embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment withcorresponding values for the 6th embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 11 and Table 12as the following values and satisfy the following conditions:

6th Embodiment f [mm] 2.24 |f1/f2| 0.71 Fno 2.12 |f1/f3| 0.08 HFOV[deg.] 45.4 f4/f5 −1.07 FOV [deg.] 90.80 f/f3 0.06 (V1 + V2)/(V3 + V4)2.89 |f/f4| + |f/f5| 2.55 V3 + V4 39.0 (f/f4) − (f/f5) −2.55 (R3 +R4)/(R3 − R4) 2.12 TL/ImgH 1.54 (|R5| + |R6|)/f 0.54 TL/ImgH +1/tan(HFOV) 2.53 (|R7| + |R8|)/f 0.88 f/Y52 1.26 |Dr1s/Dsr2| 0.15

Furthermore, in the imaging lens assembly according to the 6thembodiment, when the focal length of the first lens element 610 is f1,the focal length of the second lens element 620 is f2, the focal lengthof the third lens element 630 is f3, the focal length of the fourth lenselement 640 is f4, and the focal length of the fifth lens element 650 isf5, the following conditions are satisfied: |f4|<|f1|<|f3|;|f5|<|f1|<|f3|; |f4|<|f2|<|f3|; and |f5|<|f2|<|f3|.

7th Embodiment

FIG. 13 is a schematic view of an imaging apparatus according to the 7thembodiment of the present disclosure. FIG. 14 shows spherical aberrationcurves, astigmatic field curves and a distortion curve of the imagingapparatus according to the 7th embodiment. In FIG. 13, the imagingapparatus includes an imaging lens assembly (its reference numeral isomitted) and an image sensor 780. The imaging lens assembly includes, inorder from an object side to an image side, an aperture stop 700, afirst lens element 710, a second lens element 720, a third lens element730, a fourth lens element 740, a fifth lens element 750, an IR-cutfilter 760 and an image surface 770, wherein the image sensor 780 isdisposed on the image surface 770 of the imaging lens assembly. Theimaging lens assembly includes five lens elements (710, 720, 730, 740and 750) without additional one or more lens elements inserted betweenthe first lens element 710 and the fifth lens element 750.

The first lens element 710 with positive refractive power has anobject-side surface 711 being convex in a paraxial region thereof and animage-side surface 712 being concave in a paraxial region thereof. Thefirst lens element 710 is made of a plastic material, and has theobject-side surface 711 and the image-side surface 712 being bothaspheric. Furthermore, the image-side surface 712 of the first lenselement 710 includes at least one convex critical point in an off-axisregion thereof.

The second lens element 720 with positive refractive power has anobject-side surface 721 being convex in a paraxial region thereof and animage-side surface 722 being convex in a paraxial region thereof. Thesecond lens element 720 is made of a plastic material, and has theobject-side surface 721 and the image-side surface 722 being bothaspheric.

The third lens element 730 with negative refractive power has anobject-side surface 731 being concave in a paraxial region thereof andan image-side surface 732 being convex in a paraxial region thereof. Thethird lens element 730 is made of a plastic material, and has theobject-side surface 731 and the image-side surface 732 being bothaspheric.

The fourth lens element 740 with negative refractive power has anobject-side surface 741 being convex in a paraxial region thereof and animage-side surface 742 being concave in a paraxial region thereof. Thefourth lens element 740 is made of a plastic material, and has theobject-side surface 741 and the image-side surface 742 being bothaspheric. Furthermore, the object-side surface 741 of the fourth lenselement 740 includes at least one concave critical point in an off-axisregion thereof, and the image-side surface 742 of the fourth lenselement 740 includes at least one convex critical point in an off-axisregion thereof.

The fifth lens element 750 with positive refractive power has anobject-side surface 751 being convex in a paraxial region thereof and animage-side surface 752 being concave in a paraxial region thereof. Thefifth lens element 750 is made of a plastic material, and has theobject-side surface 751 and the image-side surface 752 being bothaspheric. Furthermore, the image-side surface 752 of the fifth lenselement 750 includes at least one convex critical point in an off-axisregion thereof.

The IR-cut filter 760 is made of a glass material and located betweenthe fifth lens element 750 and the image surface 770, and will notaffect the focal length of the imaging lens assembly.

The detailed optical data of the 7th embodiment are shown in Table 13and the aspheric surface data are shown in Table 14 below.

TABLE 13 7th Embodiment f = 2.24 mm, Fno = 2.08, HFOV = 44.6 deg. FocalSurface # Curvature Radius Thickness Material Index Abbe # Length 0Object Plano Infinity 1 Ape. Stop Plano −0.046  2 Lens 1 1.670 ASP 0.382Plastic 1.545 56.0 3.69 3 9.040 ASP 0.196 4 Lens 2 18.676 ASP 0.468Plastic 1.544 55.9 3.01 5 −1.780 ASP 0.187 6 Lens 3 −0.525 ASP 0.373Plastic 1.584 28.2 −7.23 7 −0.757 ASP 0.030 8 Lens 4 1.586 ASP 0.254Plastic 1.607 26.6 −0.96 9 0.401 ASP 0.030 10 Lens 5 0.378 ASP 0.563Plastic 1.544 55.9 0.78 11 1.650 ASP 0.400 12 IR-cut filter Plano 0.300Glass 1.517 64.2 — 13 Plano 0.357 14 Image Plano — Reference wavelengthis 587.6 nm (d-line).

TABLE 14 Aspheric Coefficients Surface # 2 3 4 5 6 k =  9.5993E−01 0.0000E+00 −1.0000E+00 −1.2605E+01 −2.2256E+00 A4 = −5.3312E−02−3.8305E−01 −5.1296E−01 −1.2008E+00 −2.2319E+00 A6 = −1.7455E+00 5.3339E−01  2.1381E+00  2.6418E+00  8.3278E+00 A8 =  1.4733E+01−1.1722E+01 −2.9188E+01 −1.0682E+01 −1.9550E+01 A10 = −7.0949E+01 7.1813E+01  1.6882E+02  1.8832E+01  2.8116E+01 A12 =  1.2736E+02−2.6681E+02 −5.8345E+02 −1.2935E+01 −2.0601E+01 A14 =  6.2522E+01 5.2901E+02  1.0364E+03  2.8791E+00  6.8908E+00 A16 = −3.4963E+02−4.2758E+02 −7.1773E+02  6.4235E−02 −8.2530E−01 Surface # 7 8 9 10 11 k= −2.0735E+00 −2.1461E+00 −6.4023E+00 −5.7495E+00 −1.0065E+01 A4 =−5.6109E−01 −4.0335E−01 −1.5489E−01 −1.6039E−01 −2.1855E−02 A6 = 1.1288E+00  5.0722E−01  1.0955E−01  1.7704E−01 −2.1452E−02 A8 = 4.0166E−01 −6.8982E−01 −9.3464E−02 −2.4331E−01 −2.6094E−03 A10 =−1.5227E+00  6.2387E−01  3.5783E−02  1.6407E−01  9.5755E−03 A12 =−7.3678E−01 −3.6920E−01 −1.9434E−03 −5.4629E−02 −4.3287E−03 A14 = 2.3079E+00  1.1238E−01 −1.6255E−03  8.9024E−03  7.5756E−04 A16 =−9.0283E−01 −1.3129E−02  2.3661E−04 −5.6951E−04 −4.6010E−05

In the 7th embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment withcorresponding values for the 7th embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 13 and Table 14as the following values and satisfy the following conditions:

7th Embodiment f [mm] 2.24 |f1/f2| 1.23 Fno 2.08 |f1/f3| 0.51 HFOV[deg.] 44.6 f4/f5 −1.23 FOV [deg.] 89.20 f/f3 −0.31 (V1 + V2)/(V3 + V4)2.04 |f/f4| + |f/f5| 5.21 V3 + V4 54.8 (f/f4) − (f/f5) −5.21 (R3 +R4)/(R3 − R4) 0.83 TL/ImgH 1.56 (|R5| + |R6|)/f 0.57 TL/ImgH +1/tan(HFOV) 2.58 (|R7| + |R8|)/f 0.89 f/Y52 1.26 |Dr1s/Dsr2| 0.14

Furthermore, in the imaging lens assembly according to the 7thembodiment, when the focal length of the first lens element 710 is f1,the focal length of the second lens element 720 is f2, the focal lengthof the third lens element 730 is f3, the focal length of the fourth lenselement 740 is f4, and the focal length of the fifth lens element 750 isf5, the following conditions are satisfied: |f4|<|f1|<|f3|;|f5|<|f3|<|f3|; |f4|<|f2|<|f3|; and |f5|<|f2|<|f3|.

8th Embodiment

FIG. 16 is a three-dimensional schematic view of an imaging apparatus 10according to the 8th embodiment of the present disclosure. In FIG. 16,the imaging apparatus 10 of the 8th embodiment is a camera module, theimaging apparatus 10 includes an imaging lens assembly 11, a drivingapparatus 12 and an image sensor 13, wherein the imaging lens assembly11 includes the imaging lens assembly of the 1st embodiment and a lensbarrel (not shown in drawings) for carrying the imaging lens assembly.The imaging apparatus 10 can focus light from an imaged object via theimaging lens assembly 11, perform image focusing by the drivingapparatus 12, and generate an image on the image sensor 13, and theimaging information can be transmitted.

The driving apparatus 12 can be an auto-focus module, which can bedriven by driving systems, such as voice coil motors (VCM), microelectro-mechanical systems (MEMS), piezoelectric systems, and shapememory alloys etc. The imaging lens assembly can obtain a favorableimaging position by the driving apparatus 12 so as to capture clearimages when the imaged object is disposed at different object distances.

The imaging apparatus 10 can include the image sensor 13 disposed on theimage surface of the imaging lens assembly, such as CMOS and CCD, whichhas superior photosensitivity and low noise, thus it is favorable forproviding realistic images in high definition thereof.

Moreover, the imaging apparatus 10 can further include an imagestabilization module 14, which can be a kinetic energy sensor, such asan accelerometer, a gyroscope, and a Hall effect sensor. In the 8thembodiment, the image stabilization module 14 is a gyroscope, but is notlimited thereto. Therefore, the variation of different axial directionsof the imaging lens assembly can adjusted so as to compensate the imageblur generated by motion at the moment of exposure, and it is furtherfavorable for enhancing the image quality while photographing in motionand low light situations. Furthermore, advanced image compensationfunctions, such as optical image stabilizations (OIS) and electronicimage stabilizations (EIS) etc., can be provided.

9th Embodiment

FIG. 17A is a schematic view of one side of an electronic device 20according to the 9th embodiment of the present disclosure. FIG. 17B is aschematic view of another side of the electronic device 20 of FIG. 17A.FIG. 17C is a system schematic view of the electronic device 20 of FIG.17A. In FIGS. 17A, 17B and 17C, the electronic device 20 according tothe 9th embodiment is a smartphone; the electronic device 20 includesthe imaging apparatus 10, a flash module 21, a focusing assisting module22, an image signal processor 23, a user interface 24 and an imagesoftware processor 25. When the user captures images of an imaged object26 via the user interface 24, the electronic device 20 focuses andgenerates an image via the imaging apparatus 10 while compensating forlow illumination via the flash module 21. Then, the electronic device 20quickly focuses on the imaged object according to its object distanceinformation provided by the focusing assisting module 22, and optimizesthe image via the image signal processor 23 (ISP) and the image softwareprocessor 25. Thus, the image quality can be further enhanced. Thefocusing assisting module 22 can adopt infrared or laser for obtainingquick focusing, and the user interface 24 can utilize a touch screen ora physical button for capturing and processing the image with variousfunctions of the image processing software.

The imaging apparatus 10 according to the 9th embodiment is the same asthe imaging lens assembly 10 according to the 8th embodiment, and willnot describe again herein.

10th Embodiment

FIG. 18 is a schematic view of an electronic device 30 according to the10th embodiment of the present disclosure. The electronic device 30 ofthe 10th embodiment is a tablet personal computer, wherein theelectronic device 30 includes an imaging apparatus 31, wherein theimaging apparatus 31 is the same as stated in the 8th embodiment, andwill not describe again herein.

11th Embodiment

FIG. 19 is a schematic view of an electronic device 40 according to the11th embodiment of the present disclosure. The electronic device 40 ofthe 11th embodiment is a wearable device, wherein the electronic device40 includes an imaging apparatus 41, wherein the imaging apparatus 41 isthe same as stated in the 18th embodiment, and will not describe againherein.

The foregoing description, for purpose of explanation, has beendescribed with reference to specific embodiments. It is to be noted thatTables 1-14 show different data of the different embodiments; however,the data of the different embodiments are obtained from experiments. Theembodiments were chosen and described in order to best explain theprinciples of the disclosure and its practical applications, to therebyenable others skilled in the art to best utilize the disclosure andvarious embodiments with various modifications as are suited to theparticular use contemplated. The embodiments depicted above and theappended drawings are exemplary and are not intended to be exhaustive orto limit the scope of the present disclosure to the precise formsdisclosed. Many modifications and variations are possible in view of theabove teachings.

What is claimed is:
 1. An imaging lens assembly comprising five lenselements, the five lens elements being, in order from an object side toan image side: a first lens element having positive refractive power; asecond lens element having positive refractive power; a third lenselement; a fourth lens element with negative refractive power having anobject-side surface being convex in a paraxial region thereof and animage-side surface being concave in a paraxial region thereof, whereinthe object-side surface and the image-side surface of the fourth lenselement are both aspheric; and a fifth lens element having an image-sidesurface being concave in a paraxial region thereof, wherein anobject-side surface and the image-side surface of the fifth lens elementare both aspheric, and the image-side surface of the fifth lens elementcomprises at least one convex critical point in an off-axis regionthereof; wherein a focal length of the imaging lens assembly is f, afocal length of the first lens element is f1, a focal length of thethird lens element is f3, a focal length of the fourth lens element isf4, a focal length of the fifth lens element is f5, and the followingconditions are satisfied:0.75<|f/f4|+|f/f5|; and|f1/f3|<1.0.
 2. The imaging lens assembly of claim 1, wherein the fifthlens element with positive refractive power has the object-side surfacebeing convex in a paraxial region thereof, the focal length of theimaging lens assembly is f, the focal length of the fourth lens elementis f4, the focal length of the fifth lens element is f5, and thefollowing condition is satisfied:1.25<|f/f4|+|f/f5|<3.5.
 3. The imaging lens assembly of claim 1, whereinan Abbe number of the third lens element is V3, an Abbe number of thefourth lens element is V4, and the following condition is satisfied:10<V3+V4<60.
 4. The imaging lens assembly of claim 1, wherein theobject-side surface of the fourth lens element comprises at least oneconcave critical point in an off-axis region thereof, and the image-sidesurface of the fourth lens element comprises at least one convexcritical point in an off-axis region thereof.
 5. The imaging lensassembly of claim 1, wherein the second lens element has an image-sidesurface being convex in a paraxial region thereof, a curvature radius ofan object-side surface of the second lens element is R3, a curvatureradius of the image-side surface of the second lens element is R4, andthe following condition is satisfied:0.75<(R3+R4)/(R3−R4)<4.0.
 6. The imaging lens assembly of claim 1,wherein the focal length of the first lens element is f1, a focal lengthof the second lens element is f2, the focal length of the third lenselement is f3, the focal length of the fourth lens element is f4, thefocal length of the fifth lens element is f5, and the followingconditions are satisfied:|f4|<|f1|<|f3|;|f5|<|f1|<|f3|;|f4|<|f2|<|f3|; and|f5|<|f2|<|f3|.
 7. The imaging lens assembly of claim 1, wherein thefocal length of the imaging lens assembly is f, a curvature radius ofthe object-side surface of the fourth lens element is R7, a curvatureradius of the image-side surface of the fourth lens element is R8, andthe following condition is satisfied:(|R7|+|R8|)/f<1.50.
 8. The imaging lens assembly of claim 1, wherein thethird lens element has an image-side surface being convex in a paraxialregion thereof, the focal length of the imaging lens assembly is f, thefocal length of the third lens element is f3, and the followingcondition is satisfied:−1.0<f/f3<0.50.
 9. The imaging lens assembly of claim 1, furthercomprising: an aperture stop, wherein a displacement in parallel with anoptical axis from an axial vertex of an object-side surface of the firstlens element and the aperture stop is Dr1s, and a displacement inparallel with the optical axis from the aperture stop and an axialvertex of an image-side surface of the first lens element is Dsr2, andthe following condition is satisfied:|Dr1s/Dsr2|<0.33.
 10. The imaging lens assembly of claim 1, wherein thefocal length of the imaging lens assembly is f, the focal length of thefourth lens element is f4, the focal length of the fifth lens element isf5, and the following condition is satisfied:(f/f4)−(f/f5)<−2.0.
 11. The imaging lens assembly of claim 1, whereinthe first lens element has an image-side surface comprising at least oneconvex critical point in an off-axis region thereof.
 12. The imaginglens assembly of claim 1, wherein a maximum field of view of the imaginglens assembly is FOV, an axial distance between an object-side surfaceof the first lens element and an image surface is TL, a maximum imageheight of the imaging lens assembly is ImgH, and the followingconditions are satisfied:85 degrees<FOV<120 degrees; andTL/ImgH<1.60.
 13. The imaging lens assembly of claim 1, wherein thefocal length of the imaging lens assembly is f, a maximum opticaleffective radius of the image-side surface of the fifth lens element isY52, and the following condition is satisfied:0.90<f/Y52<1.30.
 14. The imaging lens assembly of claim 1, wherein anaxial distance between an object-side surface of the first lens elementand an image surface is TL, a maximum image height of the imaging lensassembly is ImgH, a half of a maximum field of view of the imaging lensassembly is HFOV, and the following condition is satisfied:1.80<TL/ImgH+1/tan(HFOV)<2.60.
 15. An imaging apparatus, comprising: theimaging lens assembly of claim 1; and an image sensor, wherein the imagesensor is disposed on an image surface of the imaging lens assembly. 16.An electronic device, comprising: the imaging apparatus of claim
 15. 17.An imaging lens assembly comprising five lens elements, the five lenselements being, in order from an object side to an image side: a firstlens element having positive refractive power; a second lens elementwith positive refractive power having an image-side surface being convexin a paraxial region thereof; a third lens element; a fourth lenselement with negative refractive power having an image-side surfacebeing concave in a paraxial region thereof, wherein an object-sidesurface and the image-side surface of the fourth lens element are bothaspheric; and a fifth lens element having an image-side surface beingconcave in a paraxial region thereof, wherein an object-side surface andthe image-side surface of the fifth lens element are both aspheric, andthe image-side surface of the fifth lens element comprises at least oneconvex critical point in an off-axis region thereof; wherein an Abbenumber of the third lens element is V3, an Abbe number of the fourthlens element is V4, and the following condition is satisfied:10<V3+V4<60.
 18. The imaging lens assembly of claim 17, wherein a focallength of the first lens element is f1, a focal length of the secondlens element is f2, and the following condition is satisfied:0.70<|f1/f2|<|1.70.
 19. The imaging lens assembly of claim 17, wherein acurvature radius of an object-side surface of the third lens element isR5, a curvature radius of an image-side surface of the third lenselement is R6, a focal length of the imaging lens assembly is f, and thefollowing condition is satisfied:(|R5|+|R6|)/f<1.0.
 20. The imaging lens assembly of claim 17, furthercomprising: an aperture stop, wherein a displacement in parallel with anoptical axis from an axial vertex of an object-side surface of the firstlens element and the aperture stop is Dr1s, and a displacement inparallel with the optical axis from the aperture stop and an axialvertex of an image-side surface of the first lens element is Dsr2, andthe following condition is satisfied:|Dr1s/Dsr2|<0.33.
 21. The imaging lens assembly of claim 17, wherein afocal length of the fourth lens element is f4, a focal length of thefifth lens element is f5, and the following condition is satisfied:−2.0<f4/f5<−0.75.
 22. The imaging lens assembly of claim 17, wherein anAbbe number of the first lens element is V1, an Abbe number of thesecond lens element is V2, the Abbe number of the third lens element isV3, the Abbe number of the fourth lens element is V4, and the followingcondition is satisfied:1.75<(V1+V2)/(V3+V4)<3.50.
 23. The imaging lens assembly of claim 17,wherein the Abbe number of the third lens element is V3, the Abbe numberof the fourth lens element is V4, and the following condition issatisfied:25<V3+V4<50.
 24. The imaging lens assembly of claim 17, wherein a focallength of the imaging lens assembly is f, a focal length of the fourthlens element is f4, a focal length of the fifth lens element is f5, andthe following condition is satisfied:(f/f4)−(f/f5)<−2.0.
 25. The imaging lens assembly of claim 17, wherein amaximum field of view of the imaging lens assembly is FOV, an axialdistance between an object-side surface of the first lens element and animage surface is TL, a maximum image height of the imaging lens assemblyis ImgH, and the following conditions are satisfied:85 degrees<FOV<120; andTL/ImgH<1.60.